👉 Onondaga County is a county in the state of New York, United States. It is located within the western part of the state and includes the cities of Onondaga Falls and Ithaca. The county was established by the New York State Constitution on December 17, 1859, and its boundaries were drawn by Governor William H. Donohue in 1860. Onondaga County is known for its rich history and culture, with notable figures